Core for a high-frequency three-phase transformer



FIG. 1 is a perspective view of a core for a high-frequency three-phase transformer;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof, the opposite side view being a mirror image;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a cross-sectional view thereof taken along the line 5-5 of FIG. 4.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for a core for a high-frequency three-phase transformer, as shown and described. 